Three people have been charged with second-degree murder after a 5-year-old boy was killed when a hyperbaric chamber exploded at a medical facility in Michigan earlier this year, officials announced Tuesday.

Michigan Attorney Dana Nessel said key facility staff "held safety among their lowest considerations in their hyperbaric treatment practice."

Michigan Attorney General Dana Nessel has charged four people in connection with the death of a 5-year-old boy who was killed in a hyperbaric chamber explosion.

His mother was standing next to the hyperbaric chamber and suffered injuries to her arms when it exploded Jan. 31 at the Oxford Center in Troy.

Dana Nessel will be announcing the arraignment for Tammi Peterson for second-degree murder and manslaughter charges. She is the center's founder and CEO, which owned and operated the chamber.

Michigan Attorney General Dana Nessel will announce charges against the four people who were arrested in the case that led to the death of a 5-year-old boy who was

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Tamela Peterson, founder and CEO of The Oxford Center, will be arraigned, along with Jeff Mosteller, the center's safety director, according to records.